package com.qfang.common.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Date;

/**
 * Miscellaneous object utility methods. Mainly for internal use within the framework; consider Jakarta's Commons Lang
 * for a more comprehensive suite of object utilities.
 * 
 * @author Juergen Hoeller
 * @author Keith Donald
 * @author Rod Johnson
 * @author Rob Harrop
 * @author Alex Ruiz
 * @since 19.03.2004
 * @see org.apache.commons.lang.ObjectUtils
 */
public abstract class ObjectUtils {

	private static final int INITIAL_HASH = 7;

	private static final int MULTIPLIER = 31;

	private static final String EMPTY_STRING = "";

	private static final String NULL_STRING = "null";

	private static final String ARRAY_START = "{";

	private static final String ARRAY_END = "}";

	private static final String EMPTY_ARRAY = ARRAY_START + ARRAY_END;

	private static final String ARRAY_ELEMENT_SEPARATOR = ", ";

	/**
	 * Return whether the given throwable is a checked exception: that is, neither a RuntimeException nor an Error.
	 * 
	 * @param ex
	 *            the throwable to check
	 * @return whether the throwable is a checked exception
	 * @see java.lang.Exception
	 * @see java.lang.RuntimeException
	 * @see java.lang.Error
	 */
	public static boolean isCheckedException(Throwable ex) {
		return !(ex instanceof RuntimeException || ex instanceof Error);
	}

	/**
	 * Check whether the given exception is compatible with the exceptions declared in a throws clause.
	 * 
	 * @param ex
	 *            the exception to checked
	 * @param declaredExceptions
	 *            the exceptions declared in the throws clause
	 * @return whether the given exception is compatible
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public static boolean isCompatibleWithThrowsClause(Throwable ex, Class[] declaredExceptions) {
		if (!isCheckedException(ex)) {
			return true;
		}
		if (declaredExceptions != null) {
			for (Class declaredException : declaredExceptions) {
				if (declaredException.isAssignableFrom(ex.getClass())) {
					return true;
				}
			}
		}
		return false;
	}

	/**
	 * Return whether the given array is empty: that is, <code>null</code> or of zero length.
	 * 
	 * @param array
	 *            the array to check
	 */
	public static boolean isEmpty(Object[] array) {
		return array == null || array.length == 0;
	}

	/**
	 * Append the given Object to the given array, returning a new array consisting of the input array contents plus the
	 * given Object.
	 * 
	 * @param array
	 *            the array to append to (can be <code>null</code>)
	 * @param obj
	 *            the Object to append
	 * @return the new array (of the same component type; never <code>null</code>)
	 */
	@SuppressWarnings("rawtypes")
	public static Object[] addObjectToArray(Object[] array, Object obj) {
		Class compType = Object.class;
		if (array != null) {
			compType = array.getClass().getComponentType();
		} else if (obj != null) {
			compType = obj.getClass();
		}
		int newArrLength = array != null ? array.length + 1 : 1;
		Object[] newArr = (Object[]) Array.newInstance(compType, newArrLength);
		if (array != null) {
			System.arraycopy(array, 0, newArr, 0, array.length);
		}
		newArr[newArr.length - 1] = obj;
		return newArr;
	}

	/**
	 * Convert the given array (which may be a primitive array) to an object array (if necessary of primitive wrapper
	 * objects).
	 * <p>
	 * A <code>null</code> source value will be converted to an empty Object array.
	 * 
	 * @param source
	 *            the (potentially primitive) array
	 * @return the corresponding object array
	 * @throws IllegalArgumentException
	 *             if the parameter is not an array
	 */
	@SuppressWarnings("rawtypes")
	public static Object[] toObjectArray(Object source) {
		if (source instanceof Object[]) {
			return (Object[]) source;
		}
		if (source == null) {
			return new Object[0];
		}
		if (!source.getClass().isArray()) {
			throw new IllegalArgumentException("Source is not an array: " + source);
		}
		int length = Array.getLength(source);
		if (length == 0) {
			return new Object[0];
		}
		Class wrapperType = Array.get(source, 0).getClass();
		Object[] newArray = (Object[]) Array.newInstance(wrapperType, length);
		for (int i = 0; i < length; i++) {
			newArray[i] = Array.get(source, i);
		}
		return newArray;
	}

	// ---------------------------------------------------------------------
	// Convenience methods for content-based equality/hash-code handling
	// ---------------------------------------------------------------------

	/**
	 * Determine if the given objects are equal, returning <code>true</code> if both are <code>null</code> or
	 * <code>false</code> if only one is <code>null</code>.
	 * <p>
	 * Compares arrays with <code>Arrays.equals</code>, performing an equality check based on the array elements rather
	 * than the array reference.
	 * 
	 * @param o1
	 *            first Object to compare
	 * @param o2
	 *            second Object to compare
	 * @return whether the given objects are equal
	 * @see java.util.Arrays#equals
	 */
	public static boolean nullSafeEquals(Object o1, Object o2) {

		if (o1 == null || o2 == null) {
			return false;
		}
		if (o1.equals(o2)) {
			return true;
		}
		if (o1 instanceof Object[] && o2 instanceof Object[]) {
			return Arrays.equals((Object[]) o1, (Object[]) o2);
		}
		if (o1 instanceof boolean[] && o2 instanceof boolean[]) {
			return Arrays.equals((boolean[]) o1, (boolean[]) o2);
		}
		if (o1 instanceof byte[] && o2 instanceof byte[]) {
			return Arrays.equals((byte[]) o1, (byte[]) o2);
		}
		if (o1 instanceof char[] && o2 instanceof char[]) {
			return Arrays.equals((char[]) o1, (char[]) o2);
		}
		if (o1 instanceof double[] && o2 instanceof double[]) {
			return Arrays.equals((double[]) o1, (double[]) o2);
		}
		if (o1 instanceof float[] && o2 instanceof float[]) {
			return Arrays.equals((float[]) o1, (float[]) o2);
		}
		if (o1 instanceof int[] && o2 instanceof int[]) {
			return Arrays.equals((int[]) o1, (int[]) o2);
		}
		if (o1 instanceof long[] && o2 instanceof long[]) {
			return Arrays.equals((long[]) o1, (long[]) o2);
		}
		if (o1 instanceof short[] && o2 instanceof short[]) {
			return Arrays.equals((short[]) o1, (short[]) o2);
		}
		return false;
	}

	/**
	 * Return as hash code for the given object; typically the value of <code>{@link Object#hashCode()}</code>. If the
	 * object is an array, this method will delegate to any of the <code>nullSafeHashCode</code> methods for arrays in
	 * this class. If the object is <code>null</code>, this method returns 0.
	 * 
	 * @see #nullSafeHashCode(Object[])
	 * @see #nullSafeHashCode(boolean[])
	 * @see #nullSafeHashCode(byte[])
	 * @see #nullSafeHashCode(char[])
	 * @see #nullSafeHashCode(double[])
	 * @see #nullSafeHashCode(float[])
	 * @see #nullSafeHashCode(int[])
	 * @see #nullSafeHashCode(long[])
	 * @see #nullSafeHashCode(short[])
	 */
	public static int nullSafeHashCode(Object obj) {
		if (obj == null) {
			return 0;
		}
		if (obj instanceof Object[]) {
			return nullSafeHashCode((Object[]) obj);
		}
		if (obj instanceof boolean[]) {
			return nullSafeHashCode((boolean[]) obj);
		}
		if (obj instanceof byte[]) {
			return nullSafeHashCode((byte[]) obj);
		}
		if (obj instanceof char[]) {
			return nullSafeHashCode((char[]) obj);
		}
		if (obj instanceof double[]) {
			return nullSafeHashCode((double[]) obj);
		}
		if (obj instanceof float[]) {
			return nullSafeHashCode((float[]) obj);
		}
		if (obj instanceof int[]) {
			return nullSafeHashCode((int[]) obj);
		}
		if (obj instanceof long[]) {
			return nullSafeHashCode((long[]) obj);
		}
		if (obj instanceof short[]) {
			return nullSafeHashCode((short[]) obj);
		}
		return obj.hashCode();
	}

	/**
	 * Return a hash code based on the contents of the specified array. If <code>array</code> is <code>null</code>, this
	 * method returns 0.
	 */
	public static int nullSafeHashCode(Object[] array) {
		if (array == null) {
			return 0;
		}
		int hash = INITIAL_HASH;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = MULTIPLIER * hash + nullSafeHashCode(array[i]);
		}
		return hash;
	}

	/**
	 * Return a hash code based on the contents of the specified array. If <code>array</code> is <code>null</code>, this
	 * method returns 0.
	 */
	public static int nullSafeHashCode(boolean[] array) {
		if (array == null) {
			return 0;
		}
		int hash = INITIAL_HASH;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = MULTIPLIER * hash + hashCode(array[i]);
		}
		return hash;
	}

	/**
	 * Return a hash code based on the contents of the specified array. If <code>array</code> is <code>null</code>, this
	 * method returns 0.
	 */
	public static int nullSafeHashCode(byte[] array) {
		if (array == null) {
			return 0;
		}
		int hash = INITIAL_HASH;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = MULTIPLIER * hash + array[i];
		}
		return hash;
	}

	/**
	 * Return a hash code based on the contents of the specified array. If <code>array</code> is <code>null</code>, this
	 * method returns 0.
	 */
	public static int nullSafeHashCode(char[] array) {
		if (array == null) {
			return 0;
		}
		int hash = INITIAL_HASH;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = MULTIPLIER * hash + array[i];
		}
		return hash;
	}

	/**
	 * Return a hash code based on the contents of the specified array. If <code>array</code> is <code>null</code>, this
	 * method returns 0.
	 */
	public static int nullSafeHashCode(double[] array) {
		if (array == null) {
			return 0;
		}
		int hash = INITIAL_HASH;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = MULTIPLIER * hash + hashCode(array[i]);
		}
		return hash;
	}

	/**
	 * Return a hash code based on the contents of the specified array. If <code>array</code> is <code>null</code>, this
	 * method returns 0.
	 */
	public static int nullSafeHashCode(float[] array) {
		if (array == null) {
			return 0;
		}
		int hash = INITIAL_HASH;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = MULTIPLIER * hash + hashCode(array[i]);
		}
		return hash;
	}

	/**
	 * Return a hash code based on the contents of the specified array. If <code>array</code> is <code>null</code>, this
	 * method returns 0.
	 */
	public static int nullSafeHashCode(int[] array) {
		if (array == null) {
			return 0;
		}
		int hash = INITIAL_HASH;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = MULTIPLIER * hash + array[i];
		}
		return hash;
	}

	/**
	 * Return a hash code based on the contents of the specified array. If <code>array</code> is <code>null</code>, this
	 * method returns 0.
	 */
	public static int nullSafeHashCode(long[] array) {
		if (array == null) {
			return 0;
		}
		int hash = INITIAL_HASH;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = MULTIPLIER * hash + hashCode(array[i]);
		}
		return hash;
	}

	/**
	 * Return a hash code based on the contents of the specified array. If <code>array</code> is <code>null</code>, this
	 * method returns 0.
	 */
	public static int nullSafeHashCode(short[] array) {
		if (array == null) {
			return 0;
		}
		int hash = INITIAL_HASH;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; i++) {
			hash = MULTIPLIER * hash + array[i];
		}
		return hash;
	}

	/**
	 * Return the same value as <code>{@link Boolean#hashCode()}</code>.
	 * 
	 * @see Boolean#hashCode()
	 */
	public static int hashCode(boolean bool) {
		return bool ? 1231 : 1237;
	}

	/**
	 * Return the same value as <code>{@link Double#hashCode()}</code>.
	 * 
	 * @see Double#hashCode()
	 */
	public static int hashCode(double dbl) {
		long bits = Double.doubleToLongBits(dbl);
		return hashCode(bits);
	}

	/**
	 * Return the same value as <code>{@link Float#hashCode()}</code>.
	 * 
	 * @see Float#hashCode()
	 */
	public static int hashCode(float flt) {
		return Float.floatToIntBits(flt);
	}

	/**
	 * Return the same value as <code>{@link Long#hashCode()}</code>.
	 * 
	 * @see Long#hashCode()
	 */
	public static int hashCode(long lng) {
		return (int) (lng ^ lng >>> 32);
	}

	// ---------------------------------------------------------------------
	// Convenience methods for content-based toString output
	// ---------------------------------------------------------------------

	/**
	 * Return a String representation of the specified Object.
	 * <p>
	 * Returns {@link #NULL_STRING the String 'null'} if <code>obj</code> is <code>null</code>.
	 * 
	 * @param obj
	 *            the object whose String representation to return
	 * @return a String representation of <code>obj</code>
	 */
	public static String nullSafeToString(Object obj) {
		return nullSafeToString(obj, false);
	}

	public static String nullSafeToString(Object obj, boolean null2Blank) {
		if (obj == null) {
			if (null2Blank) {
				return EMPTY_STRING;
			} else {
				return NULL_STRING;
			}
		}
		if (obj instanceof String) {
			return (String) obj;
		}
		if (obj instanceof Object[]) {
			return nullSafeToString((Object[]) obj);
		}
		if (obj instanceof boolean[]) {
			return nullSafeToString((boolean[]) obj);
		}
		if (obj instanceof byte[]) {
			return nullSafeToString((byte[]) obj);
		}
		if (obj instanceof char[]) {
			return nullSafeToString((char[]) obj);
		}
		if (obj instanceof double[]) {
			return nullSafeToString((double[]) obj);
		}
		if (obj instanceof float[]) {
			return nullSafeToString((float[]) obj);
		}
		if (obj instanceof int[]) {
			return nullSafeToString((int[]) obj);
		}
		if (obj instanceof long[]) {
			return nullSafeToString((long[]) obj);
		}
		if (obj instanceof short[]) {
			return nullSafeToString((short[]) obj);
		}
		return obj.toString();

	}

	/**
	 * Return a String representation of the contents of the specified array. The String representation consists of a
	 * list of the array's elements, enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated by
	 * the characters <code>", "</code> (a comma followed by a space). Returns <code>"null"</code> if <code>array</code>
	 * is <code>null</code>.
	 * 
	 * @param array
	 *            the array whose String representation to return
	 * @return a String representation of <code>array</code>
	 */
	public static String nullSafeToString(Object[] array) {
		if (array == null) {
			return NULL_STRING;
		}
		int length = array.length;
		if (length == 0) {
			return EMPTY_ARRAY;
		}
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0) {
				buffer.append(ARRAY_START);
			} else {
				buffer.append(ARRAY_ELEMENT_SEPARATOR);
			}
			buffer.append(String.valueOf(array[i]));
		}
		buffer.append(ARRAY_END);
		return buffer.toString();
	}

	/**
	 * Return a String representation of the contents of the specified array. The String representation consists of a
	 * list of the array's elements, enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated by
	 * the characters <code>", "</code> (a comma followed by a space). Returns <code>"null"</code> if <code>array</code>
	 * is <code>null</code>.
	 * 
	 * @param array
	 *            the array whose String representation to return
	 * @return a String representation of <code>array</code>
	 */
	public static String nullSafeToString(boolean[] array) {
		if (array == null) {
			return NULL_STRING;
		}
		int length = array.length;
		if (length == 0) {
			return EMPTY_ARRAY;
		}
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0) {
				buffer.append(ARRAY_START);
			} else {
				buffer.append(ARRAY_ELEMENT_SEPARATOR);
			}

			buffer.append(array[i]);
		}
		buffer.append(ARRAY_END);
		return buffer.toString();
	}

	/**
	 * Return a String representation of the contents of the specified array. The String representation consists of a
	 * list of the array's elements, enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated by
	 * the characters <code>", "</code> (a comma followed by a space). Returns <code>"null"</code> if <code>array</code>
	 * is <code>null</code>.
	 * 
	 * @param array
	 *            the array whose String representation to return
	 * @return a String representation of <code>array</code>
	 */
	public static String nullSafeToString(byte[] array) {
		if (array == null) {
			return NULL_STRING;
		}
		int length = array.length;
		if (length == 0) {
			return EMPTY_ARRAY;
		}
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0) {
				buffer.append(ARRAY_START);
			} else {
				buffer.append(ARRAY_ELEMENT_SEPARATOR);
			}
			buffer.append(array[i]);
		}
		buffer.append(ARRAY_END);
		return buffer.toString();
	}

	/**
	 * Return a String representation of the contents of the specified array. The String representation consists of a
	 * list of the array's elements, enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated by
	 * the characters <code>", "</code> (a comma followed by a space). Returns <code>"null"</code> if <code>array</code>
	 * is <code>null</code>.
	 * 
	 * @param array
	 *            the array whose String representation to return
	 * @return a String representation of <code>array</code>
	 */
	public static String nullSafeToString(char[] array) {
		if (array == null) {
			return NULL_STRING;
		}
		int length = array.length;
		if (length == 0) {
			return EMPTY_ARRAY;
		}
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0) {
				buffer.append(ARRAY_START);
			} else {
				buffer.append(ARRAY_ELEMENT_SEPARATOR);
			}
			buffer.append("'").append(array[i]).append("'");
		}
		buffer.append(ARRAY_END);
		return buffer.toString();
	}

	/**
	 * Return a String representation of the contents of the specified array. The String representation consists of a
	 * list of the array's elements, enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated by
	 * the characters <code>", "</code> (a comma followed by a space). Returns <code>"null"</code> if <code>array</code>
	 * is <code>null</code>.
	 * 
	 * @param array
	 *            the array whose String representation to return
	 * @return a String representation of <code>array</code>
	 */
	public static String nullSafeToString(double[] array) {
		if (array == null) {
			return NULL_STRING;
		}
		int length = array.length;
		if (length == 0) {
			return EMPTY_ARRAY;
		}
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0) {
				buffer.append(ARRAY_START);
			} else {
				buffer.append(ARRAY_ELEMENT_SEPARATOR);
			}

			buffer.append(array[i]);
		}
		buffer.append(ARRAY_END);
		return buffer.toString();
	}

	/**
	 * Return a String representation of the contents of the specified array. The String representation consists of a
	 * list of the array's elements, enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated by
	 * the characters <code>", "</code> (a comma followed by a space). Returns <code>"null"</code> if <code>array</code>
	 * is <code>null</code>.
	 * 
	 * @param array
	 *            the array whose String representation to return
	 * @return a String representation of <code>array</code>
	 */
	public static String nullSafeToString(float[] array) {
		if (array == null) {
			return NULL_STRING;
		}
		int length = array.length;
		if (length == 0) {
			return EMPTY_ARRAY;
		}
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0) {
				buffer.append(ARRAY_START);
			} else {
				buffer.append(ARRAY_ELEMENT_SEPARATOR);
			}

			buffer.append(array[i]);
		}
		buffer.append(ARRAY_END);
		return buffer.toString();
	}

	/**
	 * Return a String representation of the contents of the specified array. The String representation consists of a
	 * list of the array's elements, enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated by
	 * the characters <code>", "</code> (a comma followed by a space). Returns <code>"null"</code> if <code>array</code>
	 * is <code>null</code>.
	 * 
	 * @param array
	 *            the array whose String representation to return
	 * @return a String representation of <code>array</code>
	 */
	public static String nullSafeToString(int[] array) {
		if (array == null) {
			return NULL_STRING;
		}
		int length = array.length;
		if (length == 0) {
			return EMPTY_ARRAY;
		}
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0) {
				buffer.append(ARRAY_START);
			} else {
				buffer.append(ARRAY_ELEMENT_SEPARATOR);
			}
			buffer.append(array[i]);
		}
		buffer.append(ARRAY_END);
		return buffer.toString();
	}

	/**
	 * Return a String representation of the contents of the specified array. The String representation consists of a
	 * list of the array's elements, enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated by
	 * the characters <code>", "</code> (a comma followed by a space). Returns <code>"null"</code> if <code>array</code>
	 * is <code>null</code>.
	 * 
	 * @param array
	 *            the array whose String representation to return
	 * @return a String representation of <code>array</code>
	 */
	public static String nullSafeToString(long[] array) {
		if (array == null) {
			return NULL_STRING;
		}
		int length = array.length;
		if (length == 0) {
			return EMPTY_ARRAY;
		}
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0) {
				buffer.append(ARRAY_START);
			} else {
				buffer.append(ARRAY_ELEMENT_SEPARATOR);
			}
			buffer.append(array[i]);
		}
		buffer.append(ARRAY_END);
		return buffer.toString();
	}

	/**
	 * Return a String representation of the contents of the specified array. The String representation consists of a
	 * list of the array's elements, enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated by
	 * the characters <code>", "</code> (a comma followed by a space). Returns <code>"null"</code> if <code>array</code>
	 * is <code>null</code>.
	 * 
	 * @param array
	 *            the array whose String representation to return
	 * @return a String representation of <code>array</code>
	 */
	public static String nullSafeToString(short[] array) {
		if (array == null) {
			return NULL_STRING;
		}
		int length = array.length;
		if (length == 0) {
			return EMPTY_ARRAY;
		}
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < length; i++) {
			if (i == 0) {
				buffer.append(ARRAY_START);
			} else {
				buffer.append(ARRAY_ELEMENT_SEPARATOR);
			}
			buffer.append(array[i]);
		}
		buffer.append(ARRAY_END);
		return buffer.toString();
	}

	/**
	 * Return a String representation of an object's overall identity.
	 * 
	 * @param obj
	 *            the object (may be <code>null</code>)
	 * @return the object's identity as String representation, or <code>null</code> if the object was <code>null</code>
	 */
	public static String identityToString(Object obj) {
		if (obj == null) {
			return EMPTY_STRING;
		}
		return obj.getClass().getName() + "@" + getIdentityHexString(obj);
	}

	/**
	 * Return a hex String form of an object's identity hash code.
	 * 
	 * @param obj
	 *            the object
	 * @return the object's identity code in hex notation
	 */
	public static String getIdentityHexString(Object obj) {
		return Integer.toHexString(System.identityHashCode(obj));
	}

	/**
	 * Return a content-based String representation if <code>obj</code> is not <code>null</code>; otherwise returns an
	 * empty <code>String</code>.
	 * <p>
	 * Differs from <code>nullSafeToString</code> in that it returns an empty String rather than "null" for a
	 * <code>null</code> value.
	 * 
	 * @see #nullSafeToString(Object)
	 */
	public static String getDisplayString(Object obj) {
		if (obj == null) {
			return EMPTY_STRING;
		}
		return nullSafeToString(obj);
	}

	public static Boolean isBasicType(Object obj) {
		if (obj instanceof Number || obj instanceof String || obj instanceof Date || obj instanceof Boolean) {
			return true;
		} else {
			return false;
		}
	}
	
	/**
	 * 深度克隆
	 * @param object
	 * @return
	 */
	public static Object clone(Serializable object){
		if(null==object){
			return object;
		}

		//把Object转换成byte[]
		final ByteArrayOutputStream byteOut=new ByteArrayOutputStream(); 
		ObjectOutputStream out=null;
		try {
			out = new ObjectOutputStream(byteOut);
			out.writeObject(object);
			out.flush();
		} catch (IOException e) {
			throw new RuntimeException(object.getClass().getName()+"克隆失败[把对象转换成内存数组失败]",e);
		}finally{
			try {
				out.close();
			} catch (IOException e) {
			}           
		}
		
		final byte[] objectBytes=byteOut.toByteArray();
		
		//把byte[] 转换成Object
		final ByteArrayInputStream byteIn=new ByteArrayInputStream(objectBytes);
		ObjectInputStream objectIn=null;
		try {
			objectIn = new ObjectInputStream(byteIn);
			return objectIn.readObject();
		} catch (Exception e) {
			throw new RuntimeException(object.getClass().getName()+"克隆失败[读取内存数组中的对象失败]",e);
		}finally{
			try {
				objectIn.close();
			} catch (IOException e) {
			}
		}
	}
	
	/**
	 * 创建空实体
	 * @param <T>
	 * @param obj
	 * @param createCls
	 * @return
	 */
	public static <T> T createEmptyObject(T obj,Class<T> createCls){
		if(obj==null){
			try {
				return  createCls.newInstance();
			} catch (InstantiationException e) {
				throw new RuntimeException(e);
			} catch (IllegalAccessException e) {
				throw new RuntimeException(e);
			}
		}
		return obj;
	}
	

}